upload NK edge code

EDGE_CODE/dht_22.py

@@ -0,0 +1,9 @@
+import Adafruit_DHT
+
+class dht22:
+   def __init__(self):
+      self.dht_sensor = Adafruit_DHT.DHT22
+      self.dht_pin = 4
+
+   def get_humidity_temperature(self):
+      return Adafruit_DHT.read_retry(self.dht_sensor, self.dht_pin)